2 * Copyright (c) 2016 Cisco Systems, Inc. and others. All rights reserved.
4 * This program and the accompanying materials are made available under the
5 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
6 * and is available at http://www.eclipse.org/legal/epl-v10.html
8 package org.opendaylight.protocol.pcep.ietf.stateful07;
10 import com.google.common.base.Preconditions;
11 import com.google.common.collect.ImmutableMap;
12 import com.google.common.collect.ImmutableMap.Builder;
13 import io.netty.buffer.ByteBuf;
14 import io.netty.buffer.Unpooled;
16 import org.opendaylight.protocol.pcep.spi.PCEPDeserializerException;
17 import org.opendaylight.protocol.pcep.spi.TlvParser;
18 import org.opendaylight.protocol.pcep.spi.TlvSerializer;
19 import org.opendaylight.protocol.pcep.spi.TlvUtil;
20 import org.opendaylight.protocol.util.ByteBufWriteUtil;
21 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.ietf.stateful.rev181109.path.binding.tlv.PathBinding;
22 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.ietf.stateful.rev181109.path.binding.tlv.PathBindingBuilder;
23 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.ietf.stateful.rev181109.path.binding.tlv.path.binding.BindingTypeValue;
24 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.ietf.stateful.rev181109.path.binding.tlv.path.binding.binding.type.value.MplsLabel;
25 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.ietf.stateful.rev181109.path.binding.tlv.path.binding.binding.type.value.MplsLabelBuilder;
26 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.ietf.stateful.rev181109.path.binding.tlv.path.binding.binding.type.value.MplsLabelEntry;
27 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.ietf.stateful.rev181109.path.binding.tlv.path.binding.binding.type.value.MplsLabelEntryBuilder;
28 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev181109.Tlv;
29 import org.opendaylight.yangtools.concepts.Codec;
32 * Parser for {@link PathBinding}.
34 public final class PathBindingTlvParser implements TlvParser, TlvSerializer {
36 // TODO: to be confirmed by IANA
37 public static final int TYPE = 31;
39 private static final int MPLS_LABEL = 0;
40 private static final int MPLS_STACK_ENTRY = 1;
42 private static final int LABEL_MASK = 0xfffff;
43 private static final int TC_MASK = 0x7;
44 private static final int S_MASK = 0x1;
45 private static final int TTL_MASK = 0xff;
46 private static final int LABEL_SHIFT = 12;
47 private static final int TC_SHIFT = LABEL_SHIFT - 3;
48 private static final int S_SHIFT = TC_SHIFT - 1;
49 private static final int MPLS_ENTRY_LENGTH = 4;
50 private static final int MPLS_BINDING_LENGTH = MPLS_ENTRY_LENGTH + 2;
52 private static final Map<Integer, PathBindingTlvCodec> BT_PARSERS;
53 private static final Map<Class<? extends BindingTypeValue>, PathBindingTlvCodec> BT_SERIALIZERS;
56 final MplsLabelCodec mplsLabelCodec = new MplsLabelCodec();
57 final MplsLabelEntryCodec mplsLabelEntryCodec = new MplsLabelEntryCodec();
58 final Builder<Integer, PathBindingTlvCodec> parsers = ImmutableMap.builder();
59 final Builder<Class<? extends BindingTypeValue>, PathBindingTlvCodec> serializers =
60 ImmutableMap.builder();
62 parsers.put(mplsLabelCodec.getBindingType(), mplsLabelCodec);
63 serializers.put(MplsLabel.class, mplsLabelCodec);
65 parsers.put(mplsLabelEntryCodec.getBindingType(), mplsLabelEntryCodec);
66 serializers.put(MplsLabelEntry.class, mplsLabelEntryCodec);
68 BT_PARSERS = parsers.build();
69 BT_SERIALIZERS = serializers.build();
73 public void serializeTlv(final Tlv tlv, final ByteBuf buffer) {
74 Preconditions.checkArgument(tlv instanceof PathBinding,
75 "The TLV must be PathBinding type, but was %s", tlv.getClass());
76 final PathBinding pTlv = (PathBinding) tlv;
77 final BindingTypeValue bindingTypeValue = pTlv.getBindingTypeValue();
78 Preconditions.checkArgument(bindingTypeValue != null,
79 "Missing Binding Value in Path Bidning TLV: %s", pTlv);
80 final ByteBuf body = Unpooled.buffer(MPLS_BINDING_LENGTH);
81 final PathBindingTlvCodec codec = BT_SERIALIZERS.get(bindingTypeValue.getImplementedInterface());
82 Preconditions.checkArgument(codec != null,
83 "Unsupported Path Binding Type: %s", bindingTypeValue.getImplementedInterface());
84 ByteBufWriteUtil.writeUnsignedShort(codec.getBindingType(), body);
85 body.writeBytes(codec.serialize(bindingTypeValue));
87 TlvUtil.formatTlv(TYPE, body, buffer);
91 public Tlv parseTlv(final ByteBuf buffer) throws PCEPDeserializerException {
95 final int type = buffer.readUnsignedShort();
96 final PathBindingTlvCodec codec = BT_PARSERS.get(type);
98 throw new PCEPDeserializerException("Unsupported Path Binding Type: " + type);
100 return new PathBindingBuilder().setBindingTypeValue(codec.deserialize(buffer)).build();
103 private static final class MplsLabelCodec implements PathBindingTlvCodec {
106 public ByteBuf serialize(final BindingTypeValue bindingValue) {
107 Preconditions.checkArgument(bindingValue instanceof MplsLabel, "bindingValue is not MplsLabel");
108 final MplsLabel mplsLabel = (MplsLabel) bindingValue;
109 final ByteBuf value = Unpooled.buffer(MPLS_ENTRY_LENGTH);
110 ByteBufWriteUtil.writeUnsignedInt(getMplsStackEntry(mplsLabel.getMplsLabel()), value);
115 public BindingTypeValue deserialize(final ByteBuf buffer) {
116 final MplsLabelBuilder builder = new MplsLabelBuilder();
117 builder.setMplsLabel(getMplsLabel(buffer.readUnsignedInt()));
118 return builder.build();
122 public int getBindingType() {
127 private static final class MplsLabelEntryCodec implements PathBindingTlvCodec {
130 public ByteBuf serialize(final BindingTypeValue bindingValue) {
131 Preconditions.checkArgument(bindingValue instanceof MplsLabelEntry,
132 "bindingValue is not MplsLabelEntry");
133 final MplsLabelEntry mplsEntry = (MplsLabelEntry) bindingValue;
134 final ByteBuf value = Unpooled.buffer(MPLS_ENTRY_LENGTH);
135 final long entry = getMplsStackEntry(mplsEntry.getLabel())
136 | mplsEntry.getTrafficClass() << TC_SHIFT
137 | (mplsEntry.isBottomOfStack() ? 1 : 0) << S_SHIFT
138 | mplsEntry.getTimeToLive();
139 ByteBufWriteUtil.writeUnsignedInt(entry, value);
144 public BindingTypeValue deserialize(final ByteBuf buffer) {
145 final MplsLabelEntryBuilder builder = new MplsLabelEntryBuilder();
146 final long entry = buffer.readUnsignedInt();
147 builder.setLabel(getMplsLabel(entry));
148 builder.setTrafficClass((short) (entry >> TC_SHIFT & TC_MASK));
149 builder.setBottomOfStack((entry >> S_SHIFT & S_MASK) == 1);
150 builder.setTimeToLive((short) (entry & TTL_MASK));
151 return builder.build();
155 public int getBindingType() {
156 return MPLS_STACK_ENTRY;
160 private interface PathBindingTlvCodec extends Codec<ByteBuf, BindingTypeValue> {
161 int getBindingType();
164 private static org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.network.concepts.rev131125.MplsLabel
165 getMplsLabel(final long mplsStackEntry) {
166 return new org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.network.concepts.rev131125
167 .MplsLabel(mplsStackEntry >> LABEL_SHIFT & LABEL_MASK);
170 private static long getMplsStackEntry(final org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.network
171 .concepts.rev131125.MplsLabel mplsLabel) {
172 return mplsLabel.getValue() << LABEL_SHIFT;